[master] Define _ALLSOURCE in pngconf.h when building with nonANSI AIX compiler.

otherwise AIX reserves "jmpbuf" and renames it to "__jmpbuf".

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.4.1rc02 - February 18, 2010
+Libpng 1.4.1rc03 - February 19, 2010
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,20 +9,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.4.1rc02.tar.xz (LZMA-compressed, recommended)
-   1.4.1rc02.tar.gz
-   1.4.1rc02.tar.bz2
+   1.4.1rc03.tar.xz (LZMA-compressed, recommended)
+   1.4.1rc03.tar.gz
+   1.4.1rc03.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp141r02.zip
-   lp141r02.7z
+   lp141r03.zip
+   lp141r03.7z
 
 Other information:
 
-   1.4.1rc02-README.txt
-   1.4.1rc02-LICENSE.txt
+   1.4.1rc03-README.txt
+   1.4.1rc03-LICENSE.txt
 
 Changes since the last public release (1.4.0):
 
@@ -82,13 +82,19 @@ version 1.4.1beta11 [February 12, 2010]
   Relocated misplaced closing curley bracket in png_decompress_chunk().
   Complete rewrite of two-pass png_decompress_chunk() by John Bowler.
 
-version 1.4.1beta12 [February 18, 2010]
+version 1.4.1beta12 [February 14, 2010]
   Fixed type declaration of png_get_user_malloc_max() in pngget.c (Daisuke
     Nishikawa)
 
 version 1.4.1rc02 [February 18, 2010]
   No changes.
 
+version 1.4.1rc03 [February 19, 2010]
+  Noted in scripts/makefile.mingw that it expects to be run under MSYS.
+  Removed obsolete unused MMX-querying support from contrib/gregbook
+  Removed the AIX redefinition of jmpbuf in png.h
+  Define _ALLSOURCE in pngconf.h when building with nonANSI AIX compiler.
+
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